diff --git a/lib/libc/rpc/svc_simple.c b/lib/libc/rpc/svc_simple.c
index 9ce3f8d4efbc..1c60950e0a21 100644
--- a/lib/libc/rpc/svc_simple.c
+++ b/lib/libc/rpc/svc_simple.c
@@ -272,7 +272,7 @@ universal(struct svc_req *rqstp, SVCXPRT *transp)
 			/* decode arguments into a CLEAN buffer */
 			xdrbuf = pl->p_xdrbuf;
 			/* Zero the arguments: reqd ! */
-			(void) memset(xdrbuf, 0, sizeof (pl->p_recvsz));
+			(void) memset(xdrbuf, 0, (size_t)pl->p_recvsz);
 			/*
 			 * Assuming that sizeof (xdrbuf) would be enough
 			 * for the arguments; if not then the program